Compasses or dividers.



PATENTED APRJ, 1903.

0.5mm). commssss 0 DIVIDBRS.

APPLICATION FILED FEB. 55., 1900.

H0 MODEL.

Mm o m m m 1 M M 2 2w 7 6.0

Wimesses To-Lmla, WASHINGTON. 0. c4

UNITED STATES? PATENT OFFICE} CHARLES EDWARD HAND, OF MONTREAL, CANADA.

COMPASSES oR DIVIDERS.

I SPECIFICATION forming part of Letters Patent No. 724,697, dated April 7,1903. Application filed February 5, 1900. Serial No. 3,977. (No model.)

To a whom it mayconcerni Be it known thatLOHARL sEDwARD HAND,-

' viders; and I do hereby declare that the following is a full, clear, and'exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

7 This invention relates to improvements in compasses or dividers; and its obj ectis to pro-. vide a draftsmans compass or dividerin which the points and pencil will always be maintained in a perpendicular plane whatever may be the angle of separation of the legs of the instrument.

A further object is to provide a compass or divider which is simple in construction, effective in operation, and which may be manufactured at a moderate cost.

To these ends the invention consists in'a compass or divider constructed substantially as-hereinafter illustrated and described, and defined in .the appended claims.

Referring to the drawings, in which similar letters of reference indicate similar parts, Figure 1 is a view in perspective of a compass constructed in accordance with this invention. Fig. 2 is a similar view showing the reverse side thereof. Fig. 3 is a view similar to Fig. 1, showing the compass in'its folded position. Fig. l is a side elevation, part of the plate being removed to show the construction. Fig. 5 is a vertical section through the pivot.

. In the drawings, A and A represent the legs of a compass or similar tool, which may be of any usual or preferred form and material. As shown, they are of metal and provided at their inner ends with enlarged heads a a, which are preferably formed disk-shaped, as clearly shown in Fig. 4. The disk heads a and a are placed side by side and united by the pivot a To the disk at of the leg Ais pivoted the plate B by means of a pivot-pin b passing through the disk 0, at a point one side of the pivot-pin a whereby the pivot b is eccentric to the pivot a To the plate B is secured-the link I), which extends substantially parallel to the leg A". The outer ends of both the leg A and the link I) are pivoted to a socketplate D, the pivot of the link I) being arranged above and to one side of the pivot of the leg A, as clearly shown in Fig. 2. The socketplate D is adapted to receive a suitable pencil C or point C.

The leg A and the plate B and link I) are identical in construction, arrangement, and operation with the corresponding parts above described and require no further detailed explanation. I

The lower portion of the ends 19 of the plates B and B are curved and overlap and project somewhat below the disk heads a and a, and their-edges nearly coincide'with the edges of the disk heads, asshown in Fig. 4.

To each of the pivot-pins b is loosely connected a strap 6 e, the lower ends of which extend below the ends bi of the plates B and B and are connected by the threaded rod E, having the binding-nut e thereon, by means of which the parts of the device may be locked in any adjusted position.

The links I) b are arranged parallel at all times to the legs or members A and A, respectively; but these links are not connected directly andpivotally with the legs or members of which they form companions. On the other hand, I employ the clips or plates B B as the means for slidably connecting each link with its companion member and pivotally with the other member that is to say, the clip or plate B is secured to the link I), is arranged to slidably embrace the member or leg A, and is connected pivotally with the head of the other leg or member A'and in like manner the clip or plate B is made fast with the link it slidably embraces the leg or member A, and is connected pivotally with the head of the other leg or member A. This construction, connection, and arrangement of the parts permits the legs or members A A to be opened on the pivotal connection between the heads thereof, and at the same time the links I) b open or close with the legs and are capable of a limited endwise movement ICC clips or plates which are made fast with the links and'which slidably embrace the legs or members is advantageous, because these clips keep the links in the same planes as the legs or members, thereby relieving undue strain on the pivots which connect the links and the legs with the socket-pieces and with each other. The straps e e are disposed on opposite sides of the clips and of the heads of the legs or members, and these straps are loosely fitted at one end on the pivots which connect the links to the legs, as shown clearly by the drawings. The outer ends of the straps are extended within the edges of the clips and the heads of the legs, and these ends of the straps are connected by the threaded rod or bolt E, one end of which is headed, and the other end receives the thumb-nut 6*. The straps, the bolt, and the thumb-nut constitute the looking device for the legs and the links of the improved compasses. This locking device is distinguished from the ordinary quadrant employed in dividers or compasses by the fact that all the parts of my improved locking device are contained within the limits of the compasses, and the straps thereof are arranged to frictionally bind or clamp not only the legs or members, but also the links. It is to be observed that the straps bear laterally against the clips which are attached to the links of the compasses and that the heads of the pivoted legs are arranged within the clips. Now when the thumb-nut is adjusted on the rod E the straps are drawn laterally together and the plate or clips and heads of the members are frictionally bound, so that the parts cannot have relative movement in the use of the implement. The legs and their companion links are arranged in the same transverse planes; but the socket-pieces D are applied laterally against these legs and links, so as to lie in difierent planes. These socket pieces are provided on their outer sides with ofistanding loops or clips, as shown by Figs. 1 and 3 of the drawings, and said loops or clips thus lie in different planes from the legs and the links. This construction and arrangement is advantageous, because the pencil or the center pin may be easily thrust into or withdrawn from the loops or clips. When the compasses are folded or closed together, as shown by Fig. 3, the socket-pieces assume perpendicular positions alongside of the respective pairs of legs and links, and the pencil and the centering pin may now be reversed in the loops of the socket-pieces, thus disposing the parts within a very small compass or space and enabling the entire device to be easily carried in the pocket.

While Ihave heroin shown a preferred form of carrying my invention into effect, yet I do not desire to limit myself to such preferred details of construction, but claim the right to use any and all modifications thereof which will serve to carry into effect the objects to be attained by this invention in so far as such modifications and changes may fall within the spirit and scope of my said invention.

The straps provide a very convenient and effective means of clamping the clips, plates, or extensions, which in the embodiment of the invention represented by the drawings are connected orattached to the links, said clips, plates, or extensions being clamped latorally and frictionally with relation to each other and to the heads on the members. These clips, plates, or extensions, in addition to serving as the means for connecting the links frictionally with the heads of the pivoted members, are also employed in my construction as guides or as slidable connections between the pivoted members and the links, whereby the general structure is strengthened and the members and the links are kept in proper relative positions.

From the foregoing description, taken in connection with the drawings, it will be seen that the plates, clips, or extended portions of the links serve as the means for securing the frictional engagement with other portions of the compass by embracing the outer faces of the disk-heads of the members, such frictional engagement between these parts tending to relieve the strain upon the pivot which connects the disk-heads of the members, the pivots in compasses of this class being generally quitesmall. I do not, therefore, desire to strictly confine myself to the precise construction disclosed herein, because the right is reserved to use the disk-like heads of the members and the clips, plates, or extensions of the links for the purpose herein set forth and in any advantageous relation in which the parts may be disposed.

I claim- 1. Compasses,comprisingthe membersA,A pivoted together, links confined in slidable parallel relation to said members and with the link of each member connected by an eccentrically-disposed pivot to the other member, clamping-straps normally disposed to frictionally embrace the member, means connecting the straps, and socket-pieces each pivoted to one member and its companion link, substantially as described.

2. Compasses,comprisingthe members A,A pivoted together, links disposed parallel to said members, socket-pieces each pivoted to one member and its companion link, the clips or plates each fastened to one link, slidably embracing the companion member, and having eccentric pivotal connection with the other member, and a clamping device frictionally embracing the clips and adapted'to bind the members and their links firmly in the adjusted positions, substantially as described.

3. A com pass or divider consisting of members having disk-like heads pivoted together, socket-pieces at the ends of said members, links connected to said socket-pieces, and flanges connected with the links and disposed in lateral contact with the disk-like heads of the members, said flanges frictionally engaging the heads and having eccentric connections with said heads, which connections are adapted to give movement to the links rela'-' tive to the members, substantially as described.

4. A compass or divider consisting of two members having disk-like heads concentrically pivoted together, socket-pieces pivotally attached to the ends of the members, links connected pivotally with said socket-pieces, flanges or extensions of the links disposed in frictional engagement with the disk-heads and connected therewith by eccentric pivots, and means for clamping or compressing said flanges orextensions and disks together so as to frictionally engage each other, substantially as and for the purposes set forth.

5. A pair of compasses or dividers composed of the members and the links pivotally united at the top, the socket-pieces pivoted CHARLES EDWARD HAND.

Witnesses:

VICTOR H. ELLAOOTT, O. Cusnme. 

